Soil liquefaction occurs when
a. seismic vibrations have no impact on topsoil.
b. seismic vibrations pollute the entire atmosphere.
c. seismic vibrations cause the ground to act like a liquid.
d. seismic vibrations impact only the inner core of earth.

The question is asking to choose among the following choices that state when Soil liquefaction occurs, base on my research and further investigation, I would say that the answer would be letter C. seismic vibrations cause the ground to act like a liquid. I hope this would help 

2cool and cold temperature unless its an ever green tree 

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city.